ESP32/ESP8266 library to control Philips 3200 coffee machine

This repository is upgraded fork from https://github.com/mkorenko/esp-phillips-3200 which adds Simple WebServer that enables you to control the machine from your mobile/PC browser by accessing the ESP32 IP address. It also improves wiring and fixes minor issues.
Note 1: Update the statically set IP address to match your router settings).
Note 2: I've set the IP as static because on the previously tested ESP8266 the modules did not connect to my Asus AI mesh router system (and the static IP fixes that).

This project is based on:
https://github.com/mkorenko/esp-phillips-3200
https://github.com/chris7topher/SmartPhilips2200
https://github.com/micki88/Philips-ep3200-testing
https://github.com/walthowd/Philips-ep3200-ha
https://github.com/veonua/SmartPhilips

A video in German(by @chris7topher) for explanation with ESP8266 can be found here:
https://youtu.be/jhzEMkL5Xek

Used these parts:

• NodeMCU ESP32 v1
• Molex 90325-0008 Connector
• Molex 92315-0825 Cable
• BC33725TFR NPN Transistor

For NodeMCU boards you don't need to convert voltage as they have onboard voltage regulators.

My Arduino IDE board name: DOIT ESP32 DEVKIT V1

Library defaults

ESP32:
- uses Serial / UART0 to connect to the coffee machine
- uses HardwareSerial(2) / UART2 - RX2_PIN / TX2_PIN to connect to the display:
  #define RX2_PIN 16 // Rx2 from display
  #define TX2_PIN 17 // Tx2 not used
  #define NPN_E_PIN 23 // D23 Gnd for display (to switch it on and off)

ESP8266:
- uses Serial / UART0 to connect to connect to the coffee machine
- uses SoftwareSerial - RX2_PIN / TX2_PIN to the display:
  #define RX2_PIN 14 // Rx from display
  #define TX2_PIN 12 // Tx not used
  #define NPN_E_PIN 13 // Gnd for display (to switch it on and off)

Library API / usage example

Consider the following Arduino IDE project example:

void on_machine_state_changed() {
  // callback is fired when state of the coffee machine changes

  // available public properties:

  // false - off, true - on
  bool power_status = machine.current_power_status;

  // machine statuses:
  // "off"
  // "heating" - the machine is heating / initializing
  // "ready" - ready, nothing is selected
  // "ready_aqua_clean" - ready + aqua clean warning
  // "selected" - brew is selected
  // "brewing" - brewing
  // "error_no_water" - no water / water tank is ejected
  // "error_grounds_container" - grounds container light is on
  // "error" - other errors
  std::string machine_status = machine.current_machine_status;

  // brews, available for "selected" and "brewing" machine statuses:
  // "espresso", "2x_espresso", "coffee", "2x_coffee",
  // "americano", "2x_americano", "cappuccino", "latte",
  // "hot_water"
  // "none" - if not available
  std::string brew = machine.current_brew;

  // 0 - unavailable; values: 1 - 3
  uint8_t strength_level = machine.current_strength_level;

  // 1 - "normal"; 0 - powder
  uint8_t grinder_type = machine.current_grinder_type;

  // values: 1 - 3
  uint8_t water_level = machine.current_water_level;

  // 0 - unavailable; values: 1 - 3
  uint8_t milk_level = machine.current_milk_level;
}

// API to control the machine:

// available commands:
// power: "power_on", "power_off"
// select brew:
//   "espresso", "coffee", "americano", "cappuccino", "latte", "hot_water"
// levels:
//   "coffee_strength_level", "coffee_water_level", "coffee_milk_level"
// start: "start_pause"
// other: "aqua_clean", "calc_clean", "request_info"

std::string command;
machine.send_cmd(command);

NodeMCU ESP32 v1 wiring:

The wiring within the coffee machine is as shown in the picture:

Warning! You need a voltage regulator if your ESP32 can't handle more then 3V. If you use Node MCU DevBoard - then you don't need voltage regulator (as shown here)

Molex Cable Info. It has black/red line on side for PIN1 (Shown going right to left above):

• PIN1 - 4-5V from Coffee Machine
  • Connect to ESP832 and PIN1 on Molex 90325-0008 Connector that goes to display
• PIN2 - Ground
  • Connect to Ground / GND on ESP32 and connect to collector leg of NPN transistor
• PIN3 - Ground. Connect to the PIN2 ground (otherwise the display on some machines does not start)
• PIN4 - WakeUp - Not used
• PIN5 - RX
  • This is actually TX from the coffee machine, but connects to RX pin on ESP32
    • This pin is RXD0 / GPIO3 on most boards
  • Also connect to PIN5 on Molex 90325-0008 Connector that goes to display
• PIN6 - TX
  • This is actually RX from coffee machine, but connects to TX pin on ESP32
    • This pin is TXD0 / GPIO1 on most boards
    • This is the pin that we are stealing and routing through the ESP32
• PIN7 - Prog Rx - Not used
• PIN8 - Prog Tx - Not used

Known Issues:

• The code has commented buttons for presets (to make you certain type of coffee with certain strangth and water level). But water/strength level settings does not work properly. The machine status is not updated correctly (maybe it needs longer delays..don't have time to debug it. Anybody is welcome to help with that)

Web interface screenshots:

The main manu when you power on the machine (via the web interface)

When you select the brew

When the machine is off

Note: This web interface is really just a very basic web page. Feel free to improve, stylize and commit to this repo.